In a television programme used to demonstrate scientific models, a presenter repeatedly fires a gun at a bale of hay. Inside the hay, two small cannon balls are lodged some distance apart. The hay bale is about $2\,\text{m} \times 2\,\text{m} \times 2\,\text{m}$ in size, and the cannon balls are iron, nearly spherical, and roughly $5\,\text{cm}$ across. What is the presenter likely to be showing?
- A$\alpha$-particle scattering
- B$\beta^-$ decay
- Cconservation of momentum
- Ddouble-slit interference